void main() {
  List list = [11, 22, 33, 44, 55];
  Map map = {'a': 11, 'b': 22, "c": 33, "d": 44, "e": 55};

  list.forEach((e) {
    print(e);
  });
  map.forEach((key, value) {
    print('key:$key -- value:$value');
  });
}
